1 /*
 2  *  Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
 3  *  DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  *  This code is free software; you can redistribute it and/or modify it
 6  *  under the terms of the GNU General Public License version 2 only, as
 7  *  published by the Free Software Foundation.
 8  *
 9  *  This code is distributed in the hope that it will be useful, but WITHOUT
10  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  *  version 2 for more details (a copy is included in the LICENSE file that
13  *  accompanied this code).
14  *
15  *  You should have received a copy of the GNU General Public License version
16  *  2 along with this work; if not, write to the Free Software Foundation,
17  *  Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  *  Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  *  or visit www.oracle.com if you need additional information or have any
21  *  questions.
22  */
23 
24 package org.openjdk.bench.java.lang.foreign;
25 
26 import org.openjdk.jmh.annotations.Benchmark;
27 import org.openjdk.jmh.annotations.BenchmarkMode;
28 import org.openjdk.jmh.annotations.Fork;
29 import org.openjdk.jmh.annotations.Measurement;
30 import org.openjdk.jmh.annotations.Mode;
31 import org.openjdk.jmh.annotations.OutputTimeUnit;
32 import org.openjdk.jmh.annotations.Param;
33 import org.openjdk.jmh.annotations.Setup;
34 import org.openjdk.jmh.annotations.State;
35 import org.openjdk.jmh.annotations.TearDown;
36 import org.openjdk.jmh.annotations.Warmup;
37 
38 import java.lang.foreign.Arena;
39 import java.lang.foreign.MemorySegment;
40 import java.util.Random;
41 import java.util.concurrent.TimeUnit;
42 
43 @BenchmarkMode(Mode.AverageTime)
44 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
45 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
46 @State(org.openjdk.jmh.annotations.Scope.Thread)
47 @OutputTimeUnit(TimeUnit.NANOSECONDS)
48 @Fork(value = 3, jvmArgsAppend = { "--enable-native-access=ALL-UNNAMED" })
49 public class AllocFromSliceTest extends CLayouts {
50 
51     @Param({"5", "20", "100", "500", "1000"})
52     public int size;
53     public int start;
54     public byte[] arr;
55 
56     @Setup
57     public void setup() {
58         arr = new byte[1024];
59         Random random = new Random(0);
60         random.nextBytes(arr);
61         start = random.nextInt(1024 - size);
62     }
63 
64     @Benchmark
65     public MemorySegment alloc_confined() {
66         Arena arena = Arena.ofConfined();
67         MemorySegment segment = arena.allocate(size);
68         MemorySegment.copy(arr, start, segment, C_CHAR, 0, size);
69         arena.close();
70         return segment;
71     }
72 
73     @Benchmark
74     public MemorySegment alloc_confined_slice() {
75         Arena arena = Arena.ofConfined();
76         MemorySegment segment = arena.allocateFrom(C_CHAR, MemorySegment.ofArray(arr), C_CHAR, start, size);
77         arena.close();
78         return segment;
79     }
80 }